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H. K.' SANDELL.

PHONOGRAPH.

APPLICATION FILED JULY 23.1918.

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H. K. SANDELL. PHONOGRAPH. APPUCATION FILED JULY 23.1913.

Patented J 1113' 1, 1919.

5 SHEETS-SHEET 2.

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PHONOGRAPH.

APPLICATION men JULY 23. 1am.

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K, SANBELL PHONOGRAPH. 7 APPLICATION HLED JULY 23,1916.

Paimtedl July 5 SHEETS-SHEET 4.

H. K. SANDELL.

PHONOGRAPH.

APPLICATION FILED JULY 23,19l8.

Patented July 1, 1919.

5 SHEETSSHEET 5- y V" 1Q 1 drawings. in these drawings, Figure 1 is aUNITED STATES PATENT OFFICE.

Jan-nay n-sannntn, or cniceoo. ILtmoIs. ASSIGNOR 'ro HERBERT s. MILLS,or

CHICAGO, ILLINOIS.

- rnonoeahrn.

Application and m 23, 1918. Bartel No. 246,288.

To all whom it may concern Be it known that I, HENRY K. SANDELL, acitizen of the United States, residing at Chicago, in the county of Cookand State of llllinois, have invented a new and useful Improvement inPhonographs, of which the following is a specification.

The present invention relates to' improvements in phonographs and willbe fully understood from the following specification, taken inconnection with theaccompanying section through a phonograph cabinet ofconventional form, showing in side elevation, and partly in verticalsec-tion a phonfifi graph construction in accordance with my invention;Fig. 2 is a vertical transverse section through the-diaphragms andtakenv substantially on the line 2-2 of Figs. 1 and 3; Fig. 3 is ahorizontal section throughthe lower portion of the phonograph cabinetshowing the mounting of the twin sound chambers or horns therein; Fig. 4is atop plan view of the needle-arms and related structures; Fig. 5 is abottom plan view of the needle-arms; Fig. 6 is a longitudinal verticalsection through the needle -arm taken on the line 6 of Figs. 4 and 5;Fig.

7 is aside elevation of the relatively movable needle-arm and Fig. 8 isa bottom plan view of the same; Fig. 9, is a section on the line 9--9 ofFig. 7 ;-Fig.' 10 is'a section on the line 10 of Fig, 1; Fig. '11 1s asection on the linell of .Fig. 1; -Fi 12 1s a detailed perspectiveview'of thea justin cam'; Fig. 13 is a detailedperspective view of thead usting lever; Fig. 14: is a section on the line 14 of Fig. 1; andFig. 15 is'a section on the line 15 of Fig. 2.

Byway of introduction may-'besaid that the phonograph'of the presentinven tion is what may be described as a twininstrumentthat is, itcomprises two independent sets of reproducing and amphfyr ing devices,including needle, reproducer and sounddoox or horn, combined to form a'single. instrument, the two needles being held in. a common swinging armand-opcrating tandem fashion mthe same record cove. According to thisgeneral plan the instrument is constructed as follows. v The numeral 20designates acabinet, which may be of theusual formand servingto housethe motor byfwhich the table-shaft 21 s driven. The disk-table 22carr1edby th1s Specification of Iietters Patent.

Patented July 1, 191a.

shaftsupports and drives-a disk-record in the usual manner.- Beyondthelperiphery 'of the table 22 the cabinet-top is apertured as at 23 andover the aperture is fitted a base-plate 241 which carries a pair ofdownturned, opposed elbows 2526. Within .the opposed ends of theseelbows there is journaled for swingingmovement'ahout a horizontal axis'a fitt ng '27 which in, external tal, as shown in Fig. 6. As will laterappear,

the vertical and approximately horizontal ends of the elbows 27 and 27"are connected, respectively, with the two diaphragms, con .ductingthesound vibrations from each diaphragm to the appropriate horn. The twinhorns, designated 28 and 29, are connected with the downturned ends ofthe elbows 25 and 26, respectively, and may be arranged side by sidewithin the cabinet, as shown in Fig. 3.

The outwardly-turned end of the elbow 27 b has secured thereto a curvedpipe 30, the outer end of which is return-bent to lie in alineine'ntwith the upturned end of the elbow 27. The doublediaphragm-carrying headdesignated 31 lies between the 0 posecl' ends of the pipe '30 and theelbow 2 and is provided with alining nipples, which are j ournaled intheseopposed passages, so that the diaphragm head as a wholemay swivelSince the or. ivot-in a horizontal plane. 'fittmg 27 imahingg; up thedouble elbow is itself swiveled-on'a horizontal axis in the is, ineffect, universally-jointedto the base of the phonograph, the recordmovement being, accomplished without disturbance of the connectionsbetween the diaphragmhead and the twin-horns. l The diaphragm-head "31preferably has formedas an integral part thereof fa needle bar support32 which extends horizontally outward over theface of the table, beingsusceptible of traveling over the said. table and movable "toward andaway from. the

same bythe use of the universal-joint constructionthascriloed. One ofthe two needles employed in the present phonograph is mounted in asupport which is carried directly upon the end of the needle bar supportThis needle-support or needle bar,

designated 33 and which carries the outer or left-hand one of the twoneedles shown in Fig. 1, is, functionally speaking, of the nature of ahell'-crahk,-1t's central portion being j ournaled for the slightrocking movement required upon two v rtically alining pins 34: securedin an endace of the support 32. The needle bar 33 is held upon thevertical axis-passing through the two pins 34 by a pair of screwsdisposed on opposite sides of the pins and engaging laterally projectingspring arms 36 secured to the central. portion of the needle bar. Theneedle proper is secured in the usual manner in an outwardly projectingarm of the needle bar 33 while a second, laterally projecting arm servesfor the attachment of a tension-and-compression member 37 the form of arelatively thin, flexible, soft iron wire, which extends inwardly alongthe length of the arm 32 and is attached at its other extremity to thecenter of the lower diaphragm 38, making an acute angle with the planeof the latter, as shownin'Fig. .6. The diaphragm 38 is secured to thelower portion of the double diaphragm-headin the usual manner.

The second of the two needle-bars employed in the present construction,desig nated 39, and shown in detail in Fig. 9, is of the same generalconstruction as the needle-bar 33 heretofore described. Instead of beingsecured directly to the support 32,

however. it is attached to the end-face of Qjointed for a very'limitedmovement with respect to its carrying support 32. The movement of thesapportltd'with respect to the support 32'is limited within the requiredrange by a hook-shaped projection lfiwhich lies over and embraces thesupport 32, as shown in Fig; 9. The needle-bar 39 is con nected by awire 46 with. the.- upper diaphragm 47 of thedouble diaphragm-head,

this construction being identical with that heretofore described.

The phonograph construction '18 completed by the means fof'efi'ectingthetracking of the two needles in the same groove when starting to playa record. The mechanism for accomplishing this purpose con- '(Fig. 1).

naoaeeo sists of an adjustment cam secured to the support 32 and meansfor determining the position of the needle-bar 39 relative to theneedle-bar 33 through this cam. The adju'stni'ent cam mentioned, whichis designated 48 and shown in Figs. 11 and 12, is pivoted upon and heldfrictionally in engagementwith the face of a projection it) ormed on themain needle-bar support 32. For cooperating with this cam there isprovided a thumb-lever 50, the body of which lies parallel with thelower face of the support" 32 and is pivoted thereto by a screw 51 Theend of the thnn'ibdever 50 in front of the pivot-point is adapted tobear upon the needle-bar 39. Disengngement of the adjustable thumb-lever50 from the needle-bar 39 is insured by a wire spring 52 fastenedto thethumb lever and extending inwardly along the support, and bearingagainst a depending in 53 secured midway of the support 40, thearrangement being as shown in Fig. 5. One end of the thumb-lever 50 is u)turned to lie opposite the face of the cam 8, and this end carries acontact point 54, which lies in the path of the cam surface. It will beunderstood that the adjustable cam 48 may be marked in any suitablemanner to indicate its proper adjustment for the playing of records ofany size.

he phonograph construction described in the foregoing is operative asfollows. A disk-record of the lateral-vibration type and adapted forcoiiperation with the necdleba rs described, being in place upon thetable 22, the first act to be performed tion for the size of record inquestion. The

upper end of the thumb-lever 50 is now moved toward the cam 48 and untilthe pin 5-l engages the cam surface. During this move 'neni'. of: thethuniblever the needlebar 39 'will'have been held in contact with theouterend of the thumb-lever by the wire spring 52, and the support 40will therefore be moved laterally upon its loose 11s pivot pin 41 untilthe needle-bars 33, 39 lie in such a position, that they will both enterthe-same 'oove'of the record. Tlieoperati'on 'descri ed convenientlyeffected simply by the act of grasping the needle-bar 12 support by theprojection 4'9 thereon, the thumb s u'eezi the lever 50 against the cam,whi e the needle-bar suppo'rt as a whole is lifted priorto bringingthe'needles into contact. with the record. Upon lowering the needle barsupport so that the two needles contact with the record, both of thementer the same groovetherein, one needle leading the other by a distanceof,

for eXample,-one-fourth inch.

The thumb-lever 50 is now released and by the tension of .the spring 52bearing against the pin-53 it will in general move I The resu tant tonesproduced in this manner Ell .is so July 24, 1918.

'by the two diaphragms independently of one another are transmittedthrough the separate conduitsheretofore described to the two horns 28,29, with the resultant production of a volume of sound which is justtwice that obtainable by the use of a single needle. A1 though the twoneedles which are simultar neously operative according to my inventioncannotin practice occupy the same oint in the record groove, thenecessary slig t spacing between the needles is found to have noappreciable efiect upon the tones produced.

As the needle-bar support moves across the face of the record in the actof re roducin the same, it will be apparent at the re ative-p'ositionsof the needle bars 33, 39 must change to a small extent due to thedecreased circumference of the record groove. This required freedom ofrelative motion is attainedzby thefuse ofthe independent support 40,looselypivoted at 41. The mass of the support wand, consequently, itsinertia,

later-a y on its pivot to the vibrations of the needle-bar 39 whlchitcarries, but it may move on its pivot 41 to accommodate the de-' crea'n'g circumference of the record groove and rtherlil orefiliedifi'erence between the arc struck from the center 41 and from thecenter of the diaphragm 38, within the range of motion ofthe support 140on its pivot 41,

is entirely'neglig'ib1Q, Q thatthere is no-disturbance of the'tension ofthe. wire 37' in'this slight swinging movement of the su port.

40. In practice 'I find it difii'cultto etect any difierence whateverbetween the quality or volume of the'tones produced by the needle-bars33- and 39.

Theconstruction and arrangement of the needle-bars,;and the use ofthe-relatively long tension-and-compressionmember con-i necting thesebars with the" angular diaphragm, forms the subject matteri' ofmycopendlng application, Serial'Nd. 246,447 filed While I have intnejoregoingf described in considerable detail a specificembodimentmeans formm eat that it is relatively immovable of invention, it will beunderstood that this only for the purpose of making the invention moreclear and that the details do withm the terms of the accompanyingclaims, in which it is my intention to claim all novelty inherent in theinvention as broadly as is permissible in view or the prior art.

' What I claim is:

" 1. In a phonograph, a pair of stationary independent sound amplifyinsin le diaphragm-head movab y wit respect to the said horns, twoindependent diaphragm a separate sound-conduit from each diap ragm toits respective horn, and two independent needles arranged to travel inthe same record-groove, one in ad Vance of the other, each of saidneedles being connected with one of said diaphragms.

2, In a phonograph and in-combmation, means for en porting and driving;a record, aisingle nee le-bar support, two mdependently supported andrelatively movable needles adjustably mounted on said needlebar supportand arranged to travel in the same record other, and ad usting meansincluding a cam and lover mechanism for simultaneously and positivelyadjusting the initial relatlve horns, a' mounted oove, one in advanceofthe.

s carried by the said head,

positions of the two needles whereby they will both enter the samerecord groove.

\ 3. In a phonograph and in combination, a double-diaphragm-head, two,independent dia hragms carr ed by the said head, a nee le-bar supportcarried by the head, two needle-bars mounted for bodily adjustment onewith reference to the other upon sa d needle-bar support and remote fromsaid head, and independent motion-transmlttmg devices extending alongthe said needle-bar supportand each forming a connection between oneneedle-bar and one diaphragm.

4. In a phonograph a double diaphragrfi 105 thereon, a mam needle-barsupport attached head, two independent diaphragms mounts to said diaphrahead, a nee le-bar mounted upon the en of said needle-bar support, anauxilia needle -bar support loosely connected w1th said main needle-barsupport short of its end, a needle-bar mounted upon the end of saidauxiliary needle-bar sup port, and motion-transmitting mechanismconnectin each needle-bar with one'of the said diap ragms. Y

- HENRY K. SANDELL.

